Solved

Compute cluster centroid

Posted on 2011-02-24
2
369 Views
Last Modified: 2012-05-11
How can i compute the center of a class?
if each class has many many elements.
0
Comment
Question by:dadadude
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 5

Expert Comment

by:Ultra_Master
ID: 34972167
Have a look here for various methods:
http://en.wikipedia.org/wiki/Cluster_analysis
0
 
LVL 37

Accepted Solution

by:
TommySzalapski earned 500 total points
ID: 34987452
The centroid is generally calculated as the average of all the points. I assume your classes have X,Y coordinates in there somewhere? (or X,Y,Z, or something). Just take the average of each and that's the centroid.

If you need to have one existing element be the centroid, then just use euclidean distance to find the closest one to the average location.

This is the standard way of doing it in almost all cases. You could also take the element that has the least total distance from all the others, but that takes a lot longer and will usually give you the same one anyway (maybe always).
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Iteration: Iteration is repetition of a process. A student who goes to school repeats the process of going to school everyday until graduation. We go to grocery store at least once or twice a month to buy products. We repeat this process every mont…
Prime numbers are natural numbers greater than 1 that have only two divisors (the number itself and 1). By “divisible” we mean dividend % divisor = 0 (% indicates MODULAR. It gives the reminder of a division operation). We’ll follow multiple approac…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question